x+3x-x=21

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Solution for x+3x-x=21 equation: 



x+3x-x=21

We move all terms to the left:

x+3x-x-(21)=0

We add all the numbers together, and all the variables

3x-21=0

We move all terms containing x to the left, all other terms to the right

3x=21

x=21/3

x=7

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